No but 15 is a factor of 75
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Greatest common factor of 30 and 75 is 15.
It is 15
1 and the highest common factor is 15
The Common Factors of 15 and 75 are 1, 3, 5, 15
That would be 15. Only a number ending in five would be a factor of 75. 45 is not. 35 is not. 25 is not. 15 is, and it also is a factor of 90. This makes it the highest common factor of 75 and 90, although it is not a prime factor.